北京航空航天大学学报 ›› 2019, Vol. 45 ›› Issue (3): 575-587.doi: 10.13700/j.bh.1001-5965.2018.0322

• 论文 • 上一篇    下一篇

基于相干度优化的极化顺轨干涉SAR慢小目标CFAR检测

张鹏1, 张嘉峰2, 刘涛1   

  1. 1. 海军工程大学 电子工程学院, 武汉 430033;
    2. 海军作战支援舰第二支队, 舟山 316000
  • 收稿日期:2018-06-03 出版日期:2019-03-20 发布日期:2019-04-04
  • 通讯作者: 刘涛,E-mail:liutao1018@sina.com E-mail:liutao1018@sina.com
  • 作者简介:张鹏,男,硕士研究生。主要研究方向:极化SAR图像模型辨识、极化干涉SAR慢动目标检测;张嘉峰,男,硕士,助理工程师。主要研究方向:极化SAR图像统计建模与目标CFAR检测;刘涛,男,博士,教授。主要研究方向:瞬态极化统计理论、雷达极化抗干扰、极化SAR GMTI、极化分解。
  • 基金资助:
    国家自然科学基金(61771483)

Slow and small target CFAR detection of polarimetric along-track interferometric SAR using coherence optimization

ZHANG Peng1, ZHANG Jiafeng2, LIU Tao1   

  1. 1. School of Electronic Engineering, Naval University of Engineering, Wuhan 430033, China;
    2. The Second Detachment of Naval Combat Support Ship, Zhoushan 316000, China
  • Received:2018-06-03 Online:2019-03-20 Published:2019-04-04

摘要: 为改善干涉合成孔径雷达(SAR)系统对慢动小目标的检测性能,研究了全极化顺轨干涉SAR (AT-POLINSAR)实现慢动目标恒虚警(CFAR)检测的方法。首先,通过对单基线AT-POLINSAR的系统设计,明确了其在现有技术条件下的可实现性,并对其信号形式与极化干涉回波进行了建模分析。然后,针对AT-POLINSAR 6维极化干涉矢量提出了以背景杂波平均相干度为优化准则的极化降维新方法,构建了一种统计分布类型与单极化干涉数据相同的次优极化标量干涉回波,从而使目前单极化顺轨干涉SAR (AT-INSAR)慢动目标CFAR检测方法可直接扩展至全极化情形。最后,通过检测实验对次优极化与单极化的慢动目标检测性能进行了对比分析。结果表明,次优极化方法能充分利用全极化信息提高INSAR对慢小目标的检测概率。

关键词: 极化干涉, 合成孔径雷达, 地面运动目标检测(GMTI), 雷达极化, 顺轨干涉

Abstract: To improve the slow and small target detection performance of current interferometric SAR (INSAR), a new method is explored to implement constant false alarm rate (CFAR) detection for full polarimetric along-track INSAR (AT-POLINSAR). First, by designing a single-baseline AT-POLINSAR, we point out its feasibility under current technology conditions and analyze its signal form as well as polarimetric interferometric echo. Second, a new dimension reduction method for AT-POLINSAR 6D polarimetric interferometric vector is proposed using the background clutter average coherence as optimization criterion, from which the scalar echo in suboptimal polarization that has the same distribution type with single polarization can be obtained, and then the traditional single polarimetric INSAR slow target detector can be extended to be full polarimetric. Finally, Monte Carlo experiments and AT-POLINSAR scene detection experiments are carried out to compare the slow target detection performance of suboptimal polarimetric detectors and single polarimetric ones. The results indicate that suboptimal polarization can make full use of full polarimetric information to improve the INSAR detection probability of slow and small target.

Key words: polarimetric interferometry, synthetic aperture radar, ground moving target indication (GMTI), radar polarimetry, along-track interferometry

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